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开发日志

2019-07-05:

  • 增加了对屏幕的支持，需要时可以在屏幕上打印（日志之类的）了。
  • The whole musl things work fine, given -s build_type=Debug set while doing conan create . musl/1.1.18@includeos/stable -pr gcc-8.2.0-linux-aarch64 -s build_type=Debug
  • But why????

2019-07-02:

  • 还是没有成功启动😂
  • 明天需要整合 USB
  • SD 和 file system 需要整合

2019-06-27:

  • 写了一点点 ELF Parser 的东西
  • Civ5 和 Fate of the Dragon 真好玩

2019-06-26:

  • 开始搞 sdcard 的移植（yjh & tyl）
  • 正在试图搞懂 tls 的相关逻辑；考虑 ELF 直接加载的可行方案
    • U-Boot 不行，kernel image 的格式也不是 ELF
    • 应该要手写... Multiboot binary bootloader
    • 《程序员的自我修养-链接、装载与库》比较好用

2019-06-07:

  • Fix the bugs in GPIO module and need to add the GPIO driver into includeOS.
  • (LZT: Examine the ELF header and auxiliary vectors. 咕咕ed others and apologized for his behaviour.)

2019-06-06:

  • Starting the GPIO module but still have bugs.

2019-06-05:

  • Skip the __libc_start_main executing kernel_main instead.
  • global_ctors_ok == 42 check failed and temply skip. 
    //LL_ASSERT(global_ctors_ok == 42);
SYN EXCEPTION 02000000
  • kernel_sanity_checks check failed and temply skip. 
    Global constuctors not working (or modified during run time).
SYN EXCEPTION 97800010
  • Replace cout in main.cpp with printf and finally print Hello world on the screen. 
    ZT debugging
Magic 3f000000 addrin 8
CurrentEL 00000002
size_cells : 00000001
addr_cells : 00000001
mem_offset : 00000090
RAM BASE : 0000000000000000
RAM SIZE : 000000003C000000
[aarch64 PC] constructor 
[ Machine ] Initializing heap
[ Machine ] Main memory detected as 1005104960 b
[ Machine ] Reserving 1048576 b for machine use 
* Initializing aux-vector @ 0x7fd28
* Stack protector value: 0
* Starting libc initialization
<kernel_main> libc initialization complete 
<kernel_main> OS start 
<kernel_main> sanity checks 
<kernel_main> post start 
================================================================================
                                                                              IncludeOS 0.14.2-1211 (aarch64 / 64-bit)
                                       +--> Running [ Hello world - OS included ]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  +--> WARNING: No good random source found: RDRAND/RDSEED instructions not available.
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      Hello world
                        [ main ] returned with status 0
                                                       <kernel_main> os_event_loop

2019-06-04:

  • Figured out how dtb works
  • After qemu singlestepping & u-boot code I found dtb addr stored in x0 at boot time
    • qemu-system-aarch64 -M raspi3 -S -gdb tcp::2333 -kernel test.img.14 -d in_asm -dtb ../../../ArchLinuxARM/boot/dtbs/broadcom/bcm2837-rpi-3-b-plus.dtb
    • Now debugging messages look like below:
ZT debugging
Magic 3f000000 addrin 8
CurrentEL 00000002
size_cells : 
addr_cells : 
mem_offset : 
RAM BASE : 
RAM SIZE : 
[aarch64 PC] constructor 
[ Machine ] Initializing heap
[ Machine ] Main memory detected as 1005092672 b
[ Machine ] Reserving 1048576 b for machine use 
* Elf start: 0x7ff18
/home/libreliu/OS/IncludeOS-dev-new/modified_src_editable/src/../api/util/elf_binary.hpp:56:Elf_binary Expects failed: is_ELF() 
SYN EXCEPTION 97800010

ZT debugging
Magic 3f000000 addrin 8
CurrentEL 00000002
size_cells : 
addr_cells : 
mem_offset : 
RAM BASE : 
RAM SIZE : 
[aarch64 PC] constructor 
[ Machine ] Initializing heap
[ Machine ] Main memory detected as 1005092672 b
[ Machine ] Reserving 1048576 b for machine use 
* Initializing aux-vector @ 0x7fd38
* Stack protector value: 0
* Starting libc initialization
  • Note that cell codes are still having problems, maybe we need to feed qemu with overlayed dtbs, instead of only root ones
  • Seem like the libc could not work.

2019-06-03:

  • 学习了 AArch64 Exception，分析了 exception.asm
  • 定位并修复了访问栈时产生异常的问题
    • 修改 linker.ld 的起始地址
  • 把 __serial_print 函数替换为可工作版本
  • 了解 QEMU 的工作机制

2019-06-02:

  • build / package 文件夹的区别？一个有 aarch64/linker.ld，一个直接是 linker.ld
    • 应该是因为 -bf 是构建文件夹， -pf (package folder) 是 cmake install 到的文件夹

2019-06-01:

  • 把 raspi3-tutorial 的 uart 例程整体平移到 src/arch/aarch64 中, 编译成功了
    • 在 arch_start.asm 中增加跳转
    • 在 linker.ld 中增加 .bss 段大小计算
    • 改掉初始 sp 地址(随便写了一个,但是原来的不行,被占用了)